Preparing high performance FeAl/Al2O3 coating as tritium permeation barrier

IF 2.8 2区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Nuclear Materials Pub Date : 2024-06-26 DOI:10.1016/j.jnucmat.2024.155261

Enkai Guo , Yifu He , Fen Zhong , Bowen Fu , Guangxu Cai , Changzhong Jiang , Feng Ren

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Abstract

Preparation of tritium permeation barrier (TPB) coating on the surface of structural materials is one of the most effective solutions to solve the issue of tritium permeation in tritium breeder blanket. The FeAl/Al₂O₃ coating is considered as the most promising candidate material for TPB coating due to its low hydrogen isotopes permeability, good adhesion and excellent radiation resistance. However, the current reported performance of FeAl/Al₂O₃ coating is much lower than its theoretical value. This work proposed a three-step process to prepare FeAl/Al₂O₃ TPB coating. By magnetron sputtering deposition, aluminizing and in-situ oxidation, a layer of high quality γ-Al₂O₃ about 250 nm thick was successfully formed on the 304 stainless steels. The Al₂O₃ layer was dense and no obvious defects were found. The gas-driven permeation measurements showed that the coating sample had strong ability to inhibit deuterium permeation, where the deuterium permeation flux was reduced by 5 orders of magnitude compared to the uncoated one at 600 °C, which is the best reported performance. Meanwhile, the thermal shock resistance test showed that the coating had no cracks after 50 thermal cycles. Moreover, the coating had a high electrical resistivity of approximately 3.42 × 10¹⁴ Ω cm, which could effectively reduce the magneto-hydrodynamic pressure drop (MHD) effects.

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制备作为氚渗透屏障的高性能 FeAl/Al2O3 涂层

在结构材料表面制备氚渗透屏障（TPB）涂层是解决氚增殖毯中氚渗透问题的最有效解决方案之一。FeAl/Al2O3涂层具有氢同位素渗透率低、附着力好和抗辐射性能优越等优点，被认为是最有前途的热渗透屏障涂层候选材料。然而，目前报道的 FeAl/Al2O3 涂层性能远低于其理论值。本研究提出了一种分三步制备 FeAl/Al2O3 TPB 涂层的工艺。通过磁控溅射沉积、镀铝和原位氧化，成功地在 304 不锈钢上形成了一层厚约 250 nm 的高质量 γ-Al2O3 涂层。Al2O3 层致密，未发现明显缺陷。气体驱动渗透测量结果表明，涂层样品具有很强的抑制氘渗透能力，在 600 °C 时，氘渗透通量比未涂层样品降低了 5 个数量级，这是目前报道的最佳性能。同时，抗热震性测试表明，涂层在 50 次热循环后未出现裂纹。此外，涂层还具有约 3.42 × 1014 Ω cm 的高电阻率，可有效降低磁流体压降效应（MHD）。

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来源期刊

Journal of Nuclear Materials 工程技术-材料科学：综合

CiteScore

5.70

自引率

25.80%

发文量

601

审稿时长

63 days

期刊介绍： The Journal of Nuclear Materials publishes high quality papers in materials research for nuclear applications, primarily fission reactors, fusion reactors, and similar environments including radiation areas of charged particle accelerators. Both original research and critical review papers covering experimental, theoretical, and computational aspects of either fundamental or applied nature are welcome. The breadth of the field is such that a wide range of processes and properties in the field of materials science and engineering is of interest to the readership, spanning atom-scale processes, microstructures, thermodynamics, mechanical properties, physical properties, and corrosion, for example. Topics covered by JNM Fission reactor materials, including fuels, cladding, core structures, pressure vessels, coolant interactions with materials, moderator and control components, fission product behavior. Materials aspects of the entire fuel cycle. Materials aspects of the actinides and their compounds. Performance of nuclear waste materials; materials aspects of the immobilization of wastes. Fusion reactor materials, including first walls, blankets, insulators and magnets. Neutron and charged particle radiation effects in materials, including defects, transmutations, microstructures, phase changes and macroscopic properties. Interaction of plasmas, ion beams, electron beams and electromagnetic radiation with materials relevant to nuclear systems.